Vulnerability · Published Aug 7, 2026 · Assigned by NCSC.ch
CVE-2026-54211TeamDavid: Buffer Overflow in multiple form data parameters
Critical 9.5
In plain English
A critical-severity out-of-bounds write in TeamDavid from Tobit Laboratories AG. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 51% of all known vulnerabilities).
Official description
Tobit Laboratories AG TeamDavid's Webbox application’s endpoint “//serverClient_close.html” is vulnerable to a buffer overflow vulnerability in multiple form data parameters. By submitting excessively long values in these parameters, an authenticated attacker can trigger a server crash, resulting in denial of service. Depending on the stack state or if a stack canary can be disclosed through another vulnerability, this buffer overflow could potentially be exploited for remote code execution, leading to full compromise of the server. This issue affects TeamDavid before Rollout 528. Starting with Rollout 528 (June 30, 2026), the affected functionality is disabled by default and the vulnerabilities are therefore no longer exposed through this functionality.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Tobit Laboratories AG | TeamDavid | 0 – before Rollout 528 |
Weakness: CWE-787 · Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
References
- https://chayns.net/77892-10814/tapp/763210?postId=11454 release-notes
- https://labs.infoguard.ch/posts/22-cves-in-david-a-secure-m365-alternative/ third-party-advisory